<head>
    <script type='text/javascript'>
        //Captura variables para DFP desde la url
            var getQueryString = function ( field, url ) {
            var href = url ? url : window.location.href;
            var reg = new RegExp( '[?&]' + field + '=([^&#]*)', 'i' );
            var string = reg.exec(href);
            return string ? string[1] : null;
            };
        dfp_demo = getQueryString("demo");
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<script async src="https://securepubads.g.doubleclick.net/tag/js/gpt.js"></script>
<script>
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  // Interstitial - OOP
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<script>
    window.googletag = window.googletag || {cmd: []};
    googletag.cmd.push(function() {
//required variable for refresh
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    var REFRESH_VALUE = "true";      
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    .addSize([992, 0], [970, 90]).addSize([768, 0], []).addSize([320, 0], [[320, 50]]).addSize([0, 0], [[320, 50]]).build();
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    googletag.defineSlot('/22896824604/antofagastatv/middle1', [[300, 250], [320, 100], [336, 280], [728, 90], [728, 250]],'middle1_ad').defineSizeMapping(mappingC).setTargeting(REFRESH_KEY, REFRESH_VALUE).addService(googletag.pubads());
    googletag.defineSlot('/22896824604/antofagastatv/middle2', [[300, 250], [320, 100], [336, 280], [728, 90], [728, 250]],'middle2_ad').defineSizeMapping(mappingC).setTargeting(REFRESH_KEY, REFRESH_VALUE).addService(googletag.pubads());
    googletag.defineSlot('/22896824604/antofagastatv/down', [[300, 250], [336, 280]],'down_ad').defineSizeMapping(mappingC).setTargeting(REFRESH_KEY, REFRESH_VALUE).addService(googletag.pubads());
    //adUnits Flotantes
    googletag.defineSlot('/22896824604/antofagastatv/slider', [1, 1],'slider_ad').addService(googletag.pubads());
    //Start refresh
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    googletag.pubads().setTargeting('categoria','');
    googletag.pubads().setTargeting('subcategoria',''); 
    googletag.pubads().setTargeting('tipo','');
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    googletag.pubads().setTargeting('Demo',dfp_demo);
    googletag.pubads().collapseEmptyDivs();
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  </script>

</head>

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